Microsoft Sentinel (SIEM)
Microsoft Sentinel is Microsoft's cloud-native Security Information and Event Management (SIEM) platform, built on Azure and powered by AI. It collects security data from across your entire environment — Microsoft 365, Azure, on-premises systems, and third-party services — and uses AI-powered analytics to detect threats, investigate incidents, and automate response. For UK businesses facing increasingly sophisticated cyber threats, Sentinel provides the enterprise-grade security monitoring that was previously only available to large corporations with dedicated security teams. We help businesses across London and the UK deploy, configure, and manage Microsoft Sentinel — ensuring your environment is monitored 24/7 and threats are detected and responded to before they cause damage.
Microsoft Sentinel is a cloud-native SIEM (Security Information and Event Management) platform that collects security data from across your entire environment, uses AI-powered analytics to detect threats, provides investigation tools for incident response, and automates response through playbooks. It is built on Azure and integrates with Microsoft 365, Microsoft Defender, and hundreds of third-party security solutions through connectors. Sentinel is priced based on data ingestion (pay-as-you-go or capacity reservation).
Understanding Microsoft Sentinel (SIEM)
Microsoft Sentinel is a cloud-native SIEM (Security Information and Event Management) platform that collects security data from across your entire environment, uses AI-powered analytics to detect threats, provides investigation tools for incident response, and automates response through playbooks. It is built on Azure and integrates with Microsoft 365, Microsoft Defender, and hundreds of third-party security solutions through connectors. Sentinel is priced based on data ingestion (pay-as-you-go or capacity reservation).
The business impact
Modern cyber threats are too sophisticated and too fast for manual monitoring. Sentinel uses AI to detect threats that traditional security tools miss — anomalous behaviour, lateral movement, and complex attack patterns. It provides a single pane of glass for security monitoring, investigation, and response across your entire environment. For businesses that need 24/7 security monitoring but can't justify a dedicated in-house security team, Sentinel provides enterprise-grade capabilities at a fraction of the cost.
Who needs this?
Businesses that need 24/7 security monitoring and threat detection. Businesses with compliance requirements for security monitoring and incident response (FCA, GDPR, ISO 27001). Businesses that want to consolidate security tools into a single platform. Businesses that need to investigate security incidents quickly and effectively. Businesses that want automated response to common security threats.
Who doesn't need this?
Very small businesses (1–10 users) with simple IT environments may find Microsoft 365's built-in security sufficient without a full SIEM. Businesses with very limited security data sources may not get full value from Sentinel. Businesses already using a different SIEM platform that are happy with their current solution.
The technical overview
Sentinel collects security logs and alerts from connected data sources (Microsoft 365, Azure, on-premises, third-party) through connectors. AI-powered analytics run continuously to detect threats based on built-in and custom detection rules. When a threat is detected, Sentinel creates an incident with all related evidence. Analysts investigate using the investigation graph, and automated playbooks can respond to common threats without human intervention. We handle deployment, configuration, and ongoing management.
Related technologies
What affects the cost?
Expert recommendations
Start with the most critical data sources — Microsoft 365, Entra ID, and endpoint protection — and expand from there.
Use built-in detection rules (analytics rules) as a starting point, then customise for your environment.
Implement automated playbooks for common threats — phishing, brute force, impossible travel — to reduce response time.
Regularly review and tune detection rules to reduce false positives and improve detection accuracy.
Integrate Sentinel with Microsoft Defender for Endpoint, Defender for Office 365, and Defender for Cloud for unified threat protection.
Establish a clear incident response process with defined roles, escalation paths, and communication plans.
Industries that benefit
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